A jury found Frenchman Mehdi Nemmouche guilty Thursday (March 7th) of the "terrorist murders" of four people at a Brussels' museum, in the first case of a Syria extremist veteran to stage an attack in Europe, AFP reported.

Nemmouche, 33, now faces a life sentence for the rampage in the Belgian capital on May 24th, 2014, following his return from Syria's battlefields.

Nemmouche was found to have killed the four victims in cold blood.

The 12 jurors also found fellow Frenchman Nacer Bendrer, 30, who was accused of supplying the weapons, to be the co-author of the attack.

Six days after the massacre, Nemmouche was arrested in the French city of Marseille in possession of a revolver and a Kalashnikov-type assault rifle.

In total, the prosecution said it had identified 23 pieces of evidence pointing to Nemmouche, who also physically resembles the shooter seen on the museum's surveillance video.

The prosecutors say the attack was the first carried out in Europe by an extremist returning from fighting in Syria.

In France, meanwhile, a Paris court on Thursday jailed a Franco-Algerian to 16 years in prison over trips he made to Syria between 2012 and 2014 to serve with an extremist group.

Ahmed Laidouni is believed to have travelled to Syria and joined up with al-Qaeda-affiliated al-Nusra Front (ANF) between 2012 and 2014.